The unexamined nervous system is not worth running.

Anyone with existing neck pain who is treating a laptop stand as the fix. For symptomatic office workers, the intervention with actual meta-analytic support is neck and shoulder strengthening exercise, not workstation adjustment. Skip this too if you would be buying an expensive monitor arm on the promise of pain relief — the posture change is real, the pain relief is not established, and a stack of books plus a $25 keyboard delivers the same measured effect. Also not a substitute for addressing workload, task variation and time-on-screen, which is where the prospective evidence actually points.

• No trial has shown that raising the screen reduces neck pain. The evidence is that it reduces neck flexion angle and neck-extensor muscle activity — a mechanism, not an outcome. The Cochrane review's single workstation-adjustment trial found no effect on pain or discomfort at all.
• The strongest direct study of this exact setup (riser plus external keyboard) used 20 healthy young men doing two eight-minute sessions per condition. A quarter of an hour cannot tell you anything about a symptom that develops over months, and an all-male sample of healthy young volunteers does not represent the people who actually have neck pain.

• Knowing is not changing: filling out a questionnaire moves zero biomarkers, and no trial shows Big Five feedback alone improves health. The trait-outcome correlations are real but modest (conscientiousness-longevity r = .11), and preregistered replications shrink published personality effects by about a quarter.
• The value is routing: if you score low on conscientiousness, automate (transfers, refills, calendar defaults) instead of betting on willpower; if you score high on neuroticism, weight the sleep and light cards harder.

Unsupervised cold water is a bad idea for anyone with heart disease, arrhythmia, or who cannot get out quickly — cold shock can kill before hypothermia does.

• The headline meta-analytic effect is r ≈ .075 — real, but small; expect a nudge in mood and symptoms, not a transformation, and the impact score reflects that.
• The first sessions typically make you feel worse, not better (that transient distress is part of the protocol, and the reason the effort score is low).